A Gremlin, if you also want to go for the "small and uncomfortable" factor... Or a Pacer, ditto, plus with the Pacer you get to make jokes about how it looks like a turtle... Um, a mid-70's Chevy Nova would also work, and it would be bigger....
The Chevy Nova is a good suggestion. Also, if you wanted something a little newer, something like the "K" car from the early- to mid-80s might count. They were pretty ugly, boxy things so they'll never be a treasured old car.
I was going to suggest the VW van, because, while cliche, it's often old, definitely rickety, and will fit instruments and band members but not well enough to not be cramped. ^_^
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You! Outta my head!
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Tanks, you lot!